In a weird way, most forms of open-wheel motorsports have a reliability problem that also relates to costs.
They're too damn reliable.
Gone are the days where someone might dominate, but lose the race anyway because they blew an engine or had some other failure. If Mario Andretti raced these days, he'd be a four-time Indy 500 winner with some ease. There would be no "Mario is slowing down" lore.
As a fan, it makes things more predictable, and in a race with few overtakes (most F1 faces, increasingly many IndyCar races) it's snore-inducing.
Were I an owner I would, of course, love this reliability because it creates far more cost assurance in a sport that is as expensive as fork. IndyCar added hybrids mid-season last year and they have broken down here and there. It spices things up when it happens, but owners hate it because they've grown accustomed to near 100% reliability.
Because the sport is expensive as fork, it is also likely that most drivers are trained to be conservative in overtaking. No need to mess with that cost assurance with a foolhardy dive into a corner to make a bold move.
So you get a sport based on pit strategy under-cuts and over-cuts, which is smart, and in-laps and out-laps, which takes real driver skill, but is not exactly the most compelling shirt for the casual customer. Nor easy to ascertain in real time even if you do understand the principle of it, unless you have telemetry at your fingertips, which most besides the die-st of diehards don't bother with.
You wonder though that for all of the reliability and cost assurance there is with mostly bulletproof engines and conservative passing? How much money is trickling out the door anyway because the races themselves aren't as compelling?
NASCAR's solution to this - unspoken or spoken behind closed doors - is to gimmick and crash it up as much as is humanly possible. While I find NASCAR largely unwatchable in its current form (definitely didn't feel that way in the pre-playoff era, I loved the marathon aspect of both the races themselves and the championship), I understand why they do it.